Neuro- special sense- vision and hearing

Question 1

What is emmetropic?

Answer 1

The normal (emmetropic) eye will refract light correctly and focus a clear image on the re7na.

Question 2

RODS detect presence/absence of ___

CONES exist in different types and can detect ____

Answer 2

RODS detect presence/absence of light

CONES exist in different types and can detect light of different wavelengths (colours)

Question 3

When light falls on a photoreceptor, it is absorbed by a _____ and causes a change in the configuration of a substance called ____.

Enzyme retinal isomerase converts the ___ back to ____

Answer 3

photopigment (coloured)

retinal (from cis- to trans- retinal)

trans-retinal back to cis-retinal

Question 4

The process of regeneration of the photopigments is the ___ in both rods and cones, and the ___ contributes significantly to the regeneration process, particularly in the ___; if the retina becomes detached, regeneration ____ considerably

Answer 4

same

retina

rods

decreases

Question 5

After complete bleaching, regeneration of half the rhodopsin photopigment in the rods takes about ___ and regeneration of half the pigment in cones takes ___.

Answer 5

rod: 5 mins
cones: 90 seconds

Question 6

Regeneration in photoreceptors takes place on a ___ basis to allow us to maintain vision.

Answer 6

continuous cyclical